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PIC18F1320 and wake-up

Hello, can anyone help please?

I have code that executes on wake-up from a port interrupt with the CPU clocked from the Internal oscillator block at 4 MHz. This works fine.

I've now got to add a function whereby every 15 minutes, the CPU wakes to send a signal to a remote unit to say 'I'm still working' and then revert to sleep. Low power consumption is a priority with this project.

The 16F684 (and others) have the Ultra Low-power Wake-up (ULPWU) module and I know I can implement this function externally but having looked through the data sheet I'm sure this can be done within the CPU, say, using the SEC_IDLE mode.

Enlightenment would be most welcome.

Cheers, Simon

Reply to
simon
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Hi,

I've done several projects like this that need to save power.

1) Set up with WDT for the longest time (about 2 seconds).

2) Wake up every 2 seconds and count time - if not done, go back to sleep.

3) When you get to your count. Do the job. Then go back to sleep. 
--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
Reply to
Luhan Monat

Thanks, Simon

Reply to
simon

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